Propriétés volumiques du nitrate d'éthylammonium fondu à 298 K et de ses mélanges avec l'eau

1985 ◽  
Vol 63 (3) ◽  
pp. 565-570 ◽  
Author(s):  
M. Hadded ◽  
M. Biquard ◽  
P. Letellier ◽  
R. Schaal
Keyword(s):  
Molar Volume ◽  
Salt Water ◽  
Pure Water ◽  
Molar Fraction ◽  
Partial Molar Volumes ◽  
Intrinsic Volume ◽  
Ethylammonium Nitrate ◽  
Actual Volume ◽  
Concentrated Solution ◽  
Fused Salt

Partial molar volumes of water and ethylammonium nitrate EAN are determined accurately in all water–EAN mixtures, between pure water and pure fused salt at 298 K. It has been found that the partial molar volume of water decreases linearly with molar fraction of salt, x, in concentrated solution of EAN (C > 2 mol L−1, x > 0.04). The main thermodynamic relations are established to describe the volumetric behaviour of salt, water, and solution. It has been shown that the intrinsic volume of salt can be identified roughly with the molar volume of the pure fused salt and the value of apparent molar volume of water with the actual volume of water in solution.

Pressions de vapeur des mélanges eau – nitrate d'éthylammonium à 298,15 K. Propriétés thermodynamiques des milieux eau – sel fondu

1985 ◽  
Vol 63 (12) ◽  
pp. 3587-3592 ◽  
Author(s):  
M. Biquard ◽  
P. Letellier ◽  
M. Fromon
Keyword(s):  
Activity Coefficient ◽  
Empirical Equation ◽  
Pure Water ◽  
Partial Molar Volumes ◽  
Pressure Measurements ◽  
Text Interpretation ◽  
Wide Range ◽  
Ethylammonium Nitrate ◽  
Vapor Pressure Measurements ◽  
Fused Salt

The activity and activity coefficient of water in water and ethylammonium nitrate (EAN) mixtures were determined by vapor pressure measurements between pure water and pure fused salt at 298.15 K. For a wide range of mole fractions of salt, (0.3 < X ≤ 1) the behaviour of water can be described very accurately by a "one parameter" empirical equation which involves activity coefficient, γE, mole fraction of EAN, and limiting Gibbs energy of the dilution of water in pure fused salt, [Formula: see text]:[Formula: see text]Interpretation of experimental results was also attempted by use of the B.E.T. equation. It appears that the energy, ΔEd = E − EL, in those solutions is very low. Partial molar volumes of water and salt are also discussed in relation to empirical and B.E.T. equations. It can be shown that the two equations lead to similar results.

scholarly journals VOLUMETRIC PROPERTIES OF SOLUTIONS OF DIMETHYLSULFONE IN ETHANOL-WATER MIXTURE AT TEMPERATURES RANGE OF 298.15-323.15 K

2017 ◽  
Vol 60 (7) ◽  
pp. 27
Author(s):  
Heghine H. Ghazoyan ◽  
Shiraz A. Markaryan
Keyword(s):  
Molar Volume ◽  
Apparent Molar Volume ◽  
Molar Fraction ◽  
Partial Molar Volumes ◽  
Sulfur Cycle ◽  
Apparent Molar Volumes ◽  
Volumetric Properties ◽  
Water Mixture ◽  
Molar Volumes ◽  
Volumetric Behavior

This paper studies volumetric properties of ternary dimethylsulfone-ethanol-water systems. The biomedical and environmental significance for the fundamental investigations of aqueous solution of dimethylsulfone and influences of third component on volumetric behavior of this system arises from several reasons. In the global sulfur cycle dimethylsulfide is converted to dimethylsulfone leading to an annual atmospheric production of some million tones of dimethylsulfone, much of which would be deposited in rain and snow. In addition, dimethylsulfone has been extensively studied from a medical point of view. It was established that dimethylsulfone is contained in small amounts in human blood and urine. Also of interest is that methionine is transformed into dimethylsulfone in living organisms. In this work densities of solution of dimethylsulfone in ethanol-water mixtures with various compositions have been measured over available concentration range. As it is evident from experimental data, the increase in a temperature leads to the reduction of density. The apparent and partial molar volumes of solutions were determined over the 298.15–323.15K temperature range. As it follows from these data, the apparent molar volumes increase with increasing of temperature. The influence of ethanol on the volumetric behavior has been taken into account by changing the apparent molar volume compared with the apparent molar volume of the binary aqueous solutions of DMSO2. It is found also the effect of the amount of ethanol on the volumetric properties of these solutions. It is interesting that the effect of ethanol on the values of apparent molar volumes does not change monotone with increasing in quantity of ethanol in ethanol-water mixture. In dimethylsulfone+(ethanol-water) solutions the partial molar volume of dimethylsulfone increases when quantity of ethanol in ethanol-water mixture more than 0.5 molar fraction. The observed phenomena are explained by the presence of competition of intermolecular interactions. In the DMSO2-ethanol-water system the strongest interaction between ethanol and water molecules leads to the increase in partial molar volumes for DMSO2.For citation:Ghazoyan H.H., Markaryan S.A. Volumetric properties of solutions of dimethylsulfone in ethanol-water mixture at tempe-ratures range of 298.15-323.15 K. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 7. P. 27-33.

scholarly journals A New Density Model of Quartz Solubility in H2O-CO2-NaCl Ternary Systems up to High Temperatures and High Pressures

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-23
Author(s):  
Weiping Deng ◽  
Qing Wei ◽  
Xuan Liu
Keyword(s):  
Experimental Data ◽  
Molar Volume ◽  
Partial Molar Volume ◽  
High Pressures ◽  
Pure Water ◽  
Molar Fraction ◽  
Density Model ◽  
Liquid Region ◽  
Lower Accuracy ◽  
Quartz Solubility

A novel density model for computing quartz solubility in H2O-CO2-NaCl hydrothermal fluids applicable to wide ranges of temperature and pressure is proposed. Based on the models of Akinfiev and Diamond (2009) and Wei et al. (2012), the effective partial molar volume of water ( V H 2 O ∗ ) is replaced by the partial molar volume of water ( V ¯ H 2 O ) by implementing an empirical correction, and water molar fraction ( x H 2 O ) is modified with water activity ( a H 2 O ), in addition to a series of changes to the model coefficient forms. The absolute values of averaged relative deviation of this model compared to the experimental data sets in pure water, H2O-CO2, and H2O-NaCl solutions are 5.74%, 6.69%, and 7.09%, respectively, which are better than existing models in the literature. The model can be reliably used for computing quartz solubilities in pure water from 0°C to 1000°C, from 0 bar to 20,000 bar, and in CO2- and/or NaCl-bearing solutions from 0°C to 1000°C, from 0 bar to 10,000 bar (with slightly lower accuracy at 5000-10,000 bar in H2O-NaCl systems) in the single liquid region. Moreover, the trends and overall ranges of this model may probably be more accurate in the H2O-CO2-NaCl fluid mixtures compared to the limited experimental data. In addition, a bisection algorithm for deriving the isopleths of quartz solubilities based on this new model is first proposed, and application perspectives are discussed for various geologic settings including subduction zone, lower crust-upper mantle, migmatite, pegmatite, porphyry, and orogenic deposits.

scholarly journals Behavior and properties of water in silicate melts under deep mantle conditions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bijaya B. Karki ◽  
Dipta B. Ghosh ◽  
Shun-ichiro Karato
Keyword(s):  
Electrical Conductivity ◽  
Molar Volume ◽  
Water Solution ◽  
Pure Water ◽  
Electrical Conductance ◽  
Water Structure ◽  
Bulk Water ◽  
Silicate Melts ◽  
Pressure Regime ◽  
Low Pressures

AbstractWater (H2O) as one of the most abundant fluids present in Earth plays crucial role in the generation and transport of magmas in the interior. Though hydrous silicate melts have been studied extensively, the experimental data are confined to relatively low pressures and the computational results are still rare. Moreover, these studies imply large differences in the way water influences the physical properties of silicate magmas, such as density and electrical conductivity. Here, we investigate the equation of state, speciation, and transport properties of water dissolved in Mg1−xFexSiO3 and Mg2(1−x)Fe2xSiO4 melts (for x = 0 and 0.25) as well as in its bulk (pure) fluid state over the entire mantle pressure regime at 2000–4000 K using first-principles molecular dynamics. The simulation results allow us to constrain the partial molar volume of the water component in melts along with the molar volume of pure water. The predicted volume of silicate melt + water solution is negative at low pressures and becomes almost zero above 15 GPa. Consequently, the hydrous component tends to lower the melt density to similar extent over much of the mantle pressure regime irrespective of composition. Our results also show that hydrogen diffuses fast in silicate melts and enhances the melt electrical conductivity in a way that differs from electrical conduction in the bulk water. The speciation of the water component varies considerably from the bulk water structure as well. Water is dissolved in melts mostly as hydroxyls at low pressure and as –O–H–O–, –O–H–O–H– and other extended species with increasing pressure. On the other hand, the pure water behaves as a molecular fluid below 15 GPa, gradually becoming a dissociated fluid with further compression. On the basis of modeled density and conductivity results, we suggest that partial melts containing a few percent of water may be gravitationally trapped both above and below the upper mantle-transition region. Moreover, such hydrous melts can give rise to detectable electrical conductance by means of electromagnetic sounding observations.

Experimental and Numerical Study of Methanol-Water Mixture Single-Phase Heat Transfer in a Micro-Channel Heat Sink

2012 ◽  
Author(s):  
Chun K. Kwok ◽  
Matthew M. Asada ◽  
Jonathan R. Mita ◽  
Weilin Qu
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Sink ◽  
Single Phase ◽  
Numerical Study ◽  
Pure Water ◽  
Molar Fraction ◽  
Water Mixture ◽  
Micro Channel ◽  
Numerical Predictions

This paper presents an experimental study of single-phase heat transfer characteristics of binary methanol-water mixtures in a micro-channel heat sink containing an array of 22 microchannels with 240μm × 630μm cross-section. Pure water, pure methanol, and five methanol-water mixtures with methanol molar fraction of 16%, 36%, 50%, 63% and 82% were tested. Key parametric trends were identified and discussed. The experimental study was complemented by a three-dimensional numerical simulation. Numerical predictions and experimental data are in good agreement with a mean absolute error (MAE) of 0.87%.

MOLECULAR DYNAMICS SIMULATION ON THE STRUCTURE AND DYNAMICS OF WATER IN THE 1-BUTYL-3-METHYLIMIDAZOLIUM TETRAFLUOROBORATE/WATER MIXTURE

2010 ◽  
Vol 09 (03) ◽  
pp. 573-584 ◽  
Author(s):  
GUOCAI TIAN ◽  
JIAN LI
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Pure Water ◽  
Molar Fraction ◽  
Blue Shift ◽  
Dynamics Simulation ◽  
Water Molecules ◽  
Water Mixture ◽  
Structure And Dynamics ◽  
Hydrogen Bond Interactions

The micro-structure, and IR spectrum of water molecules in 1-butyl-3-methylimi- dazolium tetrafluoroborate( [Bmim]BF4 )/water mixture with different concentrations (x1 = 25.0%, 50.0%, 75.0%, and 90.0%) were studied with molecular dynamics simulation at room temperature. It was shown that water molecules tend to be isolated from each other in mixtures with more ions than water molecules in pure water. With the increase of the molar fraction of water in the mixture, the rotation bands and the bending bands of water display red shift from 566.2 to 651.4 cm-1 and from 1638.4 to 1683.2 cm-1 respectively, whereas the O–H stretch bands show blue shift from 3519.8 to 3452 cm-1, which agree well with the experimental results. This suggests that the molecules are hindered and their motions are difficult and slow, due to the hydrogen-bond interactions and the inharmonic interactions between the inter- or intra-molecular modes of water molecules.

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